Adding machine



R. C. PATTON ADDING MACHINE Filed June 20, 1924 2 Sheets-Sheet l al ke-:4 W436.

R. c. PATTON ADDING MACHINE Filed June 20, 1924 2 Sheets-Shear Z Patented Nov. 25, 1924.

UNIT D ST TES RALPH CLIFTON PATTON, OF PROVIDENCE, RHODE ISLAND, ASSIGNOB TO PRECISION I PATENT OFFICE.

ADDING MACHINE COMPANY, 01 CHARLOTTE, NORTH CAROLINA, A CORPORATION OF NORTH CAROLINA.

ADDING macnnm' Application filed June 20, 1924. Serial 170.721 5530.

To all whom it may concern:

Be it known that I, RALPH CLIFTON PAT- TON, a citizen of the United States, residing at Providence, in the'c'ou'nty of Providence J and State of Rhode Island, have invented certain new" and useful Improvements in Adding Machines; and I do 'herebydeclare the following to be'a full, elear,'and exact description of the invention, such as will enable others skilled in the art to which it a pertains to make and use the same.

The present inventionrelates to improvements in adding machines and more specifically stated refers to the, transfer mechanism for effecting movement from one of the numeral discs toa second disc in order. The transfer lever is actuated b' a cam moved with one disc and is provi ed with a pawl for enga 'ng teeth upon the periphery ofthe disc next higher denomination, a. spring being used to keep the transfer lever against the edge of the cam and to -draw the transfer lever in one direction when the lobe of the cam passes-the lever whereby'to actuate the second" disc through an an lar distance'wcorresponding'to one subdivision" thereon. i

At thelpresent time considerable difiiculty is experienced. with theadjustment/of the I. pawl relatively to the-teeth of the/disc and the transfer lever relatively to the'cam. Of course the essential thing in a/machine of this character'is accuracy 'in the result and absolutel 8 so that t e adjustment becomes amost importa'nt item. j g

Previously it has been necessa ,to 'file the end of the spring pawl: or to "end the pawl tofsec'ure aproperrelationship of the 6 parts andit is an ob ect of the inventionto" eliminate the necessity for such make shift arrangements and to provide for the adequate and fine adjustment of. these several arts. II p With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more perplicularly pointed out in the claims appended ereto. I

. h In the drawings, wherein like symbols refer to like or corresponding parts throughout the's'everal views,

. of openin accurate'yoperation at all times 'Figure 1 is a plan view with parts broken away of an adding machine constructed according to the'present invention.

Figure 2 is a .plan view with the cover a perspective view of (the transfer lever. i

Referring more particularl to the drawings 11 designates a casing 0 need below by a ottom plate 12 secured as by the screws 13 or other fastenings and at the top by a cover 14 held in place by the fastenings 15.

The cover 14 is provided with a number are 1 which openings are arranged above the numeral discs 20, 21, 22 and23. These discs are mounted for rotation and are carried by the supporting plate mounted within the casing. The discs are each provided with cams 44, 49 and 50' except the last disc 23 in the series. An angular series of perforations are made in the discs inwardly of the marginal portions thereof which bear various designations or tables to agree with the tables shown surroundin the openings upon the cover 14. One 0 the perforations is provided opposite each subivision on the respective disc and table about the cover 0 ening and the cover obscures the numera portion of the disc except at points 'where windows 24 are pro-- indicated at 18 and 19 in Fig- Arrows are also placed upon the disc opposite certain of the perforations in order to indicate the perforation for engagement by the stylus w en restorin zero or initial position a er actuation.

the discs to the The cam 440i the initial disc is engaged by the transfer lever 51 which oscillates a out the axis of the second disc 21 and the head of the lever is enlarged and rovided with an upturned lug 62 to whic is riveted or otherwise secured a pawl 63 in position to engage the notches or teeth 61 out of its normal of the disc' 21. The

awl is made from spring material and is ent from the lug to engage the teeth. A coil spring 53 is connected between the lever 51 and a stud 54 on the supporting plate 30 in order'to'hold the lever against the'cam 44. Stationary pawls 58 and 60 are provided to engage respectively the teeth 59 of the first disc 20 and the teeth 61 of the second disc 21 for avoiding casual or accidental rotation thereof.

The cam 49 of the second disc 21 is engaged by a transfer lever 64 pivoting about the axis of'thethird disc 22 and carrying a pawl 68 engaged with the teeth 65 of said third disc. A coil spring 66 acts to draw.

the lever 64 against the cam 49.

In a similar way the cam 50 of the third disc 22 is engaged by the transfer lever 73 which ivots about the axis of the fourth disc 23 an is yieldably held against the cam by the action of the coil sprin 74. The transfer lever 73 carriesa yieldable pawl 74 to engage with the teeth 72 of the fourth disc 23. Fixed awls 69 and 71 carried by the lug on tl ie supportin plate engage res ectively the teeth 65 and 2 of the third an fourth discs to avoid retrograde movement thereof.

Upon the end of each transfer lever which engages its respective cam in a rocker 90 made of a flat piece of metal provided with a pair of upturned ears 91 pinned as at 92 to the outer free end portion of the transfer lever in order to give the strip 90 a ivotal movement in substantially the same p ane of movement with the lever 51. A facin strip 93 is secured as by rivets 94 to the bar 90 and this facing strip is provided with a projecting outer end 95 extending beyond the end of the rocker 94 and'with an elon-. gated inner end extending to the edge of the ever remote from the rocker and being bent plane by engagement with the lever edge w ereby to ut the rocker under resilient tension, the acing stri 93 being of spring metal. The extremity o the lever is -twisted as indicated at 96 to receive the set screw 97 which the outer... portion of the rocker 90. A look nut 98 upon the set screw is ada ted to hold the samev in a fixed position of a justment.

A clearing bar 79 is slidably mounted trarlilsversely in the casing and is provided wit various discs. held with the projections 78 away from the pins 77 by the a knob 83 on the clearing bar projects through a slot in the cover 14 for manipulating the bar when setting the various discs to zero position.

In operation the stylus is inserted in the perforation of the disc opposite the number on the cover and the disc is rotated in a addedwill appear at the window.

,marks will be s the end rubs on the cam.

bears against stricted onl claims.

projections 78 adapted to engage pins 77 projecting from the under sides of the The clearing bar. is normally.

action of coil springs 81 and clockwise direction until the stylus strikes the abutment 29 whereupon the number will be shown at the window 24. The next number in the addition is then added by placing the stylus in the perforation oppkosite suc number and giving the disc anot er partial rotation until the stylus strikes an abutment whereupon the sum of the two numbers After eac actuation the clearin bar is brought down, the stylus inserts in the perforation of each disc 0 posite the arrow and rotated until stopped y the projections of the clearin bar whereupon the zero own at the opening.

Now when settin the device, it is necessary that the paw? on the transfer levers shall properly engage the teeth of the next discs. For instance the pawl 63 must engage properly with the teeth 61 of the discs 21 In all positions of its movement. Any irre larity is at the resent time corrected filing the end 0 the spring pawl and by bending the spring pawl to secure the proper relationship of the parts.

In accordance with the resent invention the set screw 97 is secured in or out in order to shift the rocker toward oraway from the cam, this movement resulting in an angular movement of the transfer lever with respect to the next disc and causing the pawl to take up a correct position with respect to the teeth. The screw 97 causes a micrometer adjustment and the adjustment is secured by the lock nut 98. The facing 93 of spring steel secures long wearing ualities where e spring steel face of the rocker projects as indicated at quite a way beyond the rocker so that the latter shall not interfere with the overhanging point of the cam during the downward movement of the finger immediatel after it has slipped off the high point of t e cam.

It is obvious that various changes and modifications may be made in the details of construction and design of the above a ecifi- .cally described embodiment of this invention without departing from the spirit thereof, such cha-n s and modifications being rey the scope of the following discs rotatable in the casing beneath the openings, a cam movable with one disc, a transfer lever pivoting about the other disc and moved b saidcam, yieldable means for, holding "e transfer lever against the cam, a pawl on the transfer lever en the second disc, and a rocker adjustab piyotally mounted up agin y an sald lever for engaging the cam whereby to shift the lever and pawl angularly with respect to the second disc.

on the end portion of..

2. An adding machine comprising a cas- 0nd disc, a rocker pivoted upon the end of ing having a cover with openings therein, the lever, a facin strip secured to the rocker 10 discs rotatable in the casing beneath the and engaging t e lever for placing the openings, a cam movable with one disc, a rocker under resilient tension, said facing 5 transfer lever pivoting about the other disc strip adapted to engage the cam, and means and moved by said cam, yieldable means for for adjusting the rocker and facing strip holding the transfer lever against the cam, a substantially radially of the cam. pawl on the transfer lever engaging the sec- RALPH CLIFTON PATTON. 

